%0 Journal Article
%T INVESTIGATION ON MICROSTRUCTURE AND SUPERPLASTICITY OF A NiAL-BASED MULTIPHASE ALLOY<br>NiAl基多相金属间化合物的显微组织,超塑性研究
%A CHEN Rongshi
%A GUO Jianting
%A YIN Weimin
%A ZHOU Jiyang
%A <br>陈荣石
%A 郭建亭
%A 殷为民
%A 周继扬
%J 金属学报
%D 1998
%I 
%X The microstructure of a NiAl-based multiphase alloy with a composition of Ni-25Al-25Cr has been investigated, which consists of NiAl matrix surrounded by a eutectic of α-Cr, β-Ni(Al,Cr) and γ'-Ni3(Al,Cr), and a large amount of α-Cr precipitates distributed uniformly in NiAl matrix. This alloy exihibits superplasticity elongation as high as up to 480% at 1123-1223 K and strain rates of 2.2×10-4 -3.3×10-2 s-1. The fracture after superplasticity deformation results from cavities generated by grain boundary sliding and cleavage in the grains, the mechanism for superplasticity has also been discussed.
%K NiAl
%K superplasticity
%K microstructure
%K fracture mechanism<br>NiAl
%K 超塑性
%K 显微组织
%K 金属间化合物
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=ECDC9ECCF881A3E3086E8408F4C37779&yid=8CAA3A429E3EA654&vid=339D79302DF62549&iid=708DD6B15D2464E8&sid=F88EF6DD822B0FF5&eid=D3CBA54FACB30BD9&journal_id=0412-1961&journal_name=金属学报&referenced_num=14&reference_num=4